Description

4-[[4-[(2-Hydroxy-1-Naphthyl)Azo]Phenyl]Azo]Benzenesulphonic Acid CAS NO 37678-79-8 is a specialized azo dye intermediate characterized by its distinct molecular structure containing multiple azo linkages and a sulfonic acid group. This compound is valued for its ability to impart color and functional properties in advanced material synthesis. It is primarily sought by manufacturers in the dye and pigment industries, as well as researchers developing functional materials for electronics and sensors.

Application

• Primary Intermediate for Azo Dyes & Pigments: Serves as a key building block in the synthesis of high-performance, complex azo dyes and organic pigments, particularly for shades of orange, red, and brown.
• Textile Dyeing: Used in the production of dyes for coloring natural and synthetic fibers, offering good wash and light fastness properties.
• Ink Formulation: Employed in the manufacture of pigments for printing inks, including those used in packaging and publications.
• Functional Material Research: Investigated for use in non-linear optical materials, chemical sensors, and other advanced applications due to its conjugated azo-chromophore system.
• Liquid Crystal Displays (LCDs): Potential use as a dichroic dye guest in host-guest LCD systems for enhancing display contrast.
• Analytical Chemistry: Can be utilized as a complexometric indicator or a reagent in specific spectrophotometric determinations.

Basic Information

Product Name	4-[[4-[(2-Hydroxy-1-Naphthyl)Azo]Phenyl]Azo]Benzenesulphonic Acid
CAS No.	37678-79-8
Molecular Formula	C28H19N4O4S
Molecular Weight	507.54 g/mol
Synonyms	4-[(4-[(2-Hydroxy-1-naphthyl)azo]phenyl)azo]benzenesulfonic acid; C.I. 18050; Acid Orange 33 (principal component); Benzenesulfonic acid, 4-[[4-[(2-hydroxy-1-naphthalenyl)azo]phenyl]azo]-; Dermina Orange R; Polar Orange R; Sulfonated Azo Dye Intermediate; Bis-azo naphthol sulfonic acid
EINECS	253-608-4

Quality Control

Our production of 4-[[4-[(2-Hydroxy-1-Naphthyl)Azo]Phenyl]Azo]Benzenesulphonic Acid adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure consistency and compliance with agreed specifications. Certificates of Analysis (COA) detailing all test results are provided with each shipment to guarantee traceability and support your quality assurance processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials such as strong oxidizing agents. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Orange to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (1% in NaOH)	Clear, orange solution

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.